MEDIUM AMETHYST QUARTZ GEODA. CRYSTALS SLIGHTLY TINTED IN THE TYPICAL COLOR OF AMETHYST BUT WITH A PERFECT CRYSTALLINE SHAPE AND VERY GOOD FINISH.
Quartz is the most common mineral, the most abundant that can be found on earth.
It is composed of silicon and oxygen with SiO₂ formula.
According to the Nickel-Strunz classification, quartz belongs to the class of oxides, while in the Dana classification, it is considered a tectosilicate.
There are multiple varieties of quartz , colors and types.
